Improvement in glass-molds



NITED STATES PETER RLnnKINsOP, OF MARTms FERRY, OHIO, Ass-IGNOR To HIMSELE PATENT OEEIcE.,

AND EXCELSIOR GLASS COMPANY.

IMPROVEMENT' IN eLAlssFM'o'LD's.

Specification forming part of Letters Patent No. l 77,457, dated May 16, 1,876; application tiled March, 1876.

To all whom it may concern:

BeV it known that I, PETER BLANKINSOP;

of Martins Ferry, in the county of Belmont and State of 0hio,'have invented a new and useful Improvementin Glass-`Molds; and I do hereby declare the following to be a full, clear,

. and exact description thereof, reference being had to theaccompanying drawing, forming part of this specification', in which;

Figure 1 is a vertical section of portionsv ot'l a glass-mold embodying my invention; Fig. 2 is a detached view of the peg ring'or collar.

Like letters refer to like parts whereverthey fto permit the mold to yield under thev thrust of the plunger, whereby the peg is caused to rise in the mold during the pressing of the article, bnt'is automatically withdrawn as soon asthe pressure for forming the article is removed; second, in combining with the peg of a glass-mold a loose or detachable collar, which is capable of turning on the peg from time to time, so that the smooth face of the collar is preserved, land fins avoided; third, in combining with the bottom plate of a glass-mold interchangeable pegs, so that by changing the peg and collar the s ame bottom plate may be used with various-molds.

Heretoi'ore in the manufacture of pressed Ware, to which this invention is more especially applicable, whenever a bottom peg or plunger has been used in connection with the mold, it has been operated'either by an incline eccentric screw `and spindle or some mechanism which required the attention of the opera- -tor to cause the withdrawal of said peg before the settling of the glass, thus doubling the work ot' the operator, who in such cases has to work two plungers instead of one. The object ot' the first part Ot' the present invention is to obviatethe difcultyby rendering the movements ofthe peg or second plunger automatic. 'In pressed-glass molds, as commonly constructed, Where a goblet or like stemmed or irregular article is to be formed, a sectional mold is used next to the peg or bottom' plate. These sections wear at the line of junction in course of time, permitting the extrusion ot' glass, which cuts the face of the' bottom plate, or the face the peg-collar, itk the partsv of the moldA continue to occupy the saine rela tive position during the formation of consec utivepressed articles. y

The object of the second part ot' the invention is to obviate this diiiiculty by interpos-V ing the loose section, (peg-collar,) which per-` mits the sectional mold and bottom plate to retain their relative and necessary position to= a plunger-peg, have been such that each sep?` arate' mold required its own distinct' bottom' plate orsection, which increased the expense of molds'to that extent, and is a great disadvantage in pressed-glass molds, wherein the bottom plate has to be secured in or attached to the press.

The object of the third part of this inventioa is to render peg or bottom plates interchangeable.

I will now proceed to describe my inven-4 tion, so that others skilled in the art to which it appertains may apply thesame.

1n the drawing, a goblet-mold being chosen for illustration, the dotted lines indicate the usual or any approved form ot'- plunger and mold for bowl ot' goblet, A A the sectional portion of a mold for forming' the stem, and a the peg or bottom plunger for forming the cupfoot. B indicates the bottom plate, recessed, as at b, to form a box or chamber for a set ot' springs, b b', and countersunk, or otherwise formed, as at c, to receive the peg or bottom plunger d, which is secured by a set-screw, a. C is an annular cap or cover, which rests upon the springs b b', closing the box or recess of the bottom plate, the4 rise ot' the cover C be-A ing limited by the guides or set-screwsc1.

AThe top cover C, which may be regarded as part of, or one with, the bottom plate B, supports the superimposed portions A A', &c.,

of the mold, and the springs b b' should, of

course; be suiciently stii to support a weight slightly more than the heaviest mold with which the bottom plate is to be used. This plate C is recessed, as at c2, to receive the lower end of the peg ring or collar D, and prevent displacement of the sections during the pressing of an article. D a is peg-collar, grooved on its circumference, as at d, or, if preferred, beveled, so that .the upper portion of the collar will it within the recess e of the sectional mold A A', and lock therewith when the mold is closed, but will be free to move independently of the sections A A and ofthe bottom plate when the mold is open.

The operation of these devices is as follows: The glass being cut into the inold, and the plunger caused to descend in the usual way, the springs b b will yield, allowing` the mold to recede until the peg a has risen in the mold to the required height, and the further descent is arrested by the fixed portion of the bottom plate. The instant theplunger rises and pressure is taken off the mold the springs b lift the mold and contained article so as to free Ithe peg a, after which the sections A Al are opened and the article removed in the usual manner. As the collar D is loose upon the bottom plate, it will be slight-ly turned each time the sect-ions A A are opened and closed, thus changing the face of the collar in relation tothejoints ot' A A', thus obviating any liability of cutting o r channeling the face of the collar, which mightinterfere .with the proper working of the mold-sections.

When it is desired to change the molds-as, for instance, to manufacture wine-glasses-the interchangeable pegs may take the place of the detachable peg a, and a corresponding collar, D, be substituted, which-can be readilyv and quickly done, thus employing the same bottom plate with various molds, and saving the expense and labor incident in changing bottom plates.

The advantages of my invention are, as before specilied, saving of time andlabor in pressing the article, saving of expense in the Wear and in the number of bottom plates required, and the simplicity of the devices derived from the automatic withdrawal of thepeg.

I am aware that a cup-section for forming a goblet-foot without mark has been used in connection with abottom peg, and do not herein claim such subject-matter; but,

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s

1. Ina glass-mold, the combination of the mold with the yielding bottom plate, the rigid peg. and a spring or springs for lifting the bottom plate, substantially as and for the purpose speced.

2. In a glass-mold, the combination of the mold, the bottom plate and its peg, and a loose or detachable peg-collar, grooved to engage with the mold, substantially as and for the purpose specified.

3. In a glass-mold, the combination of the bottom plate and detachable peg and collar, substantially as and for the purpose specified.

In testimony whereof I, the said PETER BLANKINSOP, have hereunto set my hand.

F. W. RITTR, Jr., JAMES I. KAY. 

